package com.lagou.web.servlet;

import com.lagou.base.BaseServlet;
import com.lagou.base.Constants;
import com.lagou.pojo.Course;
import com.lagou.service.CourseService;
import com.lagou.service.impl.CourseServiceImpl;
import com.lagou.utils.DateUtils;
import com.lagou.utils.UUIDUtils;
import org.apache.commons.beanutils.BeanUtils;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadException;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import org.apache.commons.io.IOUtils;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

@WebServlet("/courseSalesInfo")
public class CourseSalesInfoServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {


        /**
         * 保存课程营销信息,
         * 收集表单数据， 封装到  course 对象中， 将图片  上传到 tomcat 中
         */

        try {
             //1.创建course 对象
            Course course = new Course();

            //2. 创建map 集合 用来收集数据
            Map<String, Object> map = new HashMap<>();

            //3.创建磁盘工厂对象
            DiskFileItemFactory factory = new DiskFileItemFactory();

            //4. 文件上传  核心对象
            ServletFileUpload fileUpload = new ServletFileUpload(factory);

            //5.解析request 对象  获取表单项 集合

            List<FileItem> list = fileUpload.parseRequest(req);

            //6. 遍历集合， 判断哪些是普通表单项， 哪些是文件表单项
            for (FileItem item : list ){

                boolean formField = item.isFormField();
                if (formField){
                    //普通表单项, 获取表单项的数据， 保存到map 中
                    String fieldName = item.getFieldName();

                    String value = item.getString("UTF-8");
                    System.out.println(fieldName + " " + value);

                    //使用map 收集数据
                    map.put(fieldName, value);

                }else {
                    // 文件上传项
                    //获取文件名
                    String fileName = item.getName();
                    String newFileName  = UUIDUtils.getUUID()+"_"+ fileName;

                    //获取输入流
                    InputStream in = item.getInputStream();

                    //获取 webapps 的目录路径
                    String realPath = this.getServletContext().getRealPath("/");
                    String webappsPath = realPath.substring(0, realPath.indexOf("lagou_edu_home_war"));

                    //创建输出流
                    OutputStream out = new FileOutputStream(webappsPath + "/upload/" + newFileName   );

                    IOUtils.copy(in, out);
                    out.close();
                    in.close();


                    //图片的路径进行保存
                    map.put("course_img_url", Constants.LOCAL_URL+"/upload/" + newFileName);
                }
            }

            //使用BeanUtils 将map对象中的数据  封装到 course 对象中
            BeanUtils.populate(course, map);

            String dateFormart = DateUtils.getDateFormart();

            //业务处理
            CourseService cs = new CourseServiceImpl();

            if (map.get("id") != null ){
                //修改操作
                //补全信息
                course.setUpdate_time(dateFormart); //修改时间
                String result = cs.updateCourseSalesInfo(course);

                //响应结果
                resp.getWriter().print(result);



            }else {

                //新建操作
                //补全信息

                course.setCreate_time(dateFormart); //创建时间
                course.setUpdate_time(dateFormart);//修改时间
                course.setStatus(1);                //上架

                String result = cs.saveCourseSalesInfo(course);
                //响应结果
                resp.getWriter().print(result);
            }

        } catch (Exception e) {
                e.printStackTrace();
            }


    }

    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
       doGet(req, resp);
    }
}
